The Mr.Porter page is a more significant piece of evidence. Those are major brands -- Lanvin, Common Projects, Margiela, Dries, Dolce & Gabbana, Paul Smith, and Balenciaga -- none of which were featuring or even making slip-on sneakers circa 2011, now all selling practically interchangeable shoes because they expanded into a new category in unison in response to demand.

I've seen things you people wouldn't believe.Attack ships on fire off the shoulder of Orion.I watched C-beams glitter in the dark near the Tannhäuser Gate.All those moments will be lost in time, like tears ... in ... rain.Time to die.(about 75% improvised by Rutger Hauer)Also:From The Naked City (1948)